Hammerhead signs in to the site's Bamboo SSH server through the SSH port an edge exposes, with a key of its own, and relays the shell to the browser over a WebSocket (xterm.js, served by Hammerhead). The SSH dialog shows Hammerhead's public key to add to authorized_keys. Host keys are saved on first use and a changed one is refused; the terminal opens only from the dashboard's own origin, is audited, and closes after 30 minutes idle. Errors reach the page as messages over the socket. An end-to-end test runs a real shell through the edge, tunnel and Bamboo. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>